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AuditionReview - Hearing Review Part 1 1 Sound Scenes 2...

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Hearing: Review Part 1 1. Sound “Scenes” A. Pressure changes 2. Sound as a Physical Stimulus: Pressure changes in air. 1. The speaker’s movement causes pressure changes to propagate through a medium such as air. D. Frequency (of Sine Waves) 2. Sound as a Physical Stimulus: Pressure changes in air. i. Frequency is measured in cycles per second, or Hertz ( Hz ). 1
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E. Complex Tones 2. Sound as a Physical Stimulus: Pressure changes in air. i. Complex tones result from the addition of two or more pure tones. E. Complex Tones 2. Sound as a Physical Stimulus: Pressure changes in air. ii. The construction of complex tones from pure tones is call Fourier Synthesis E. Complex Tones 2. Sound as a Physical Stimulus: Pressure changes in air. iii. Harmonics: two stimuli are harmonically related if the frequency of one is a multiple of the frequency of the other. iv. A complex tone can be decomposed into its lowest frequency component (the fundamental) and its harmonics. This is called Fourier Analysis . 2
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E. Complex Tones 2. Sound as a Physical Stimulus: Pressure changes in air. v. A graphical depiction of the frequency components in a complex tone and their amplitudes is called the Fourier Spectrum of that tone. A. Loudness: is the perceptual analog of amplitude. But, there is not a one to one correspondence. Two tones may have the same physical intensity but differ in loudness. B. Pitch: is the perceptual analog of frequency. But, there is not a one to one correspondence. Two tones may have the same pitch but differ in their physical structure. C. Timbre: The quality of a tome. Different musical instruments have different timbres, so when we play the same note on different instruments, the notes may have the same pitch and loudness, but sound different.
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